Proto Mars

Description
One of the famous founding fathers of the Machine Borg corps and the ancestor of Cyber Mars. Despite his advanced age, he still has the power to take out enemies!

Using this Borg
Source: http://www.gamefaqs.com/boards/914796-gotcha-force/66317008?page=6 Many thanks to Taioko.

Here's how you play Proto Mars, in the form of an at-range guide and an up-close guide:

Up-close:

1) Control the range being fought at. Red/Mars is good at this, so it should be easy.

2) Flick someone with your X-Beam as initiating a combo (optional)

3) POUND THEM INTO DUST

4) Victory!

At range:

1) Control the range being fought at. Red/Mars is good at this, so it should be easy.

2) Poke them with your X laser.

3) Fire the B shots so that they'll be hitting them right as their get-up invulnerability wears off

4) Knock them out of the stagger induced by the B shots with another X laser.

5) Go back to step 2 and repeat until they're dead

6) Victory!

Alternating between these two plans can be pretty effective.

Also, remember that his X-laser charges up faster depending on his level, so if you have a low-level Mars or Red, you won't be able to fire that beam as much. And you can do so much with it, having it recharge faster really does make a surprising difference.